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LCOV - code coverage report
Current view: top level - ext/bz2 - bz2.c (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 179 201 89.1 %
Date: 2014-07-25 Functions: 17 17 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   +----------------------------------------------------------------------+
       3             :   | PHP Version 5                                                        |
       4             :   +----------------------------------------------------------------------+
       5             :   | Copyright (c) 1997-2014 The PHP Group                                |
       6             :   +----------------------------------------------------------------------+
       7             :   | This source file is subject to version 3.01 of the PHP license,      |
       8             :   | that is bundled with this package in the file LICENSE, and is        |
       9             :   | available through the world-wide-web at the following url:           |
      10             :   | http://www.php.net/license/3_01.txt                                  |
      11             :   | If you did not receive a copy of the PHP license and are unable to   |
      12             :   | obtain it through the world-wide-web, please send a note to          |
      13             :   | license@php.net so we can mail you a copy immediately.               |
      14             :   +----------------------------------------------------------------------+
      15             :   | Author: Sterling Hughes <sterling@php.net>                           |
      16             :   +----------------------------------------------------------------------+
      17             : */
      18             :  
      19             : /* $Id$ */
      20             : 
      21             : #ifdef HAVE_CONFIG_H
      22             : #include "config.h"
      23             : #endif
      24             : 
      25             : #include "php.h"
      26             : #include "php_bz2.h"
      27             : 
      28             : #if HAVE_BZ2
      29             : 
      30             : /* PHP Includes */
      31             : #include "ext/standard/file.h"
      32             : #include "ext/standard/info.h"
      33             : #include "ext/standard/php_string.h"
      34             : 
      35             : /* for fileno() */
      36             : #include <stdio.h>
      37             : 
      38             : /* Internal error constants */
      39             : #define PHP_BZ_ERRNO   0
      40             : #define PHP_BZ_ERRSTR  1
      41             : #define PHP_BZ_ERRBOTH 2
      42             : 
      43             : static PHP_MINIT_FUNCTION(bz2);
      44             : static PHP_MSHUTDOWN_FUNCTION(bz2);
      45             : static PHP_MINFO_FUNCTION(bz2);
      46             : static PHP_FUNCTION(bzopen);
      47             : static PHP_FUNCTION(bzread);
      48             : static PHP_FUNCTION(bzerrno);
      49             : static PHP_FUNCTION(bzerrstr);
      50             : static PHP_FUNCTION(bzerror);
      51             : static PHP_FUNCTION(bzcompress);
      52             : static PHP_FUNCTION(bzdecompress);
      53             : 
      54             : /* {{{ arginfo */
      55             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzread, 0, 0, 1)
      56             :         ZEND_ARG_INFO(0, bz)
      57             :         ZEND_ARG_INFO(0, length)
      58             : ZEND_END_ARG_INFO()
      59             : 
      60             : ZEND_BEGIN_ARG_INFO(arginfo_bzopen, 0)
      61             :         ZEND_ARG_INFO(0, file)
      62             :         ZEND_ARG_INFO(0, mode)
      63             : ZEND_END_ARG_INFO()
      64             : 
      65             : ZEND_BEGIN_ARG_INFO(arginfo_bzerrno, 0)
      66             :         ZEND_ARG_INFO(0, bz)
      67             : ZEND_END_ARG_INFO()
      68             : 
      69             : ZEND_BEGIN_ARG_INFO(arginfo_bzerrstr, 0)
      70             :         ZEND_ARG_INFO(0, bz)
      71             : ZEND_END_ARG_INFO()
      72             : 
      73             : ZEND_BEGIN_ARG_INFO(arginfo_bzerror, 0)
      74             :         ZEND_ARG_INFO(0, bz)
      75             : ZEND_END_ARG_INFO()
      76             : 
      77             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzcompress, 0, 0, 2)
      78             :         ZEND_ARG_INFO(0, source)
      79             :         ZEND_ARG_INFO(0, blocksize)
      80             :         ZEND_ARG_INFO(0, workfactor)
      81             : ZEND_END_ARG_INFO()
      82             : 
      83             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzdecompress, 0, 0, 1)
      84             :         ZEND_ARG_INFO(0, source)
      85             :         ZEND_ARG_INFO(0, small)
      86             : ZEND_END_ARG_INFO()
      87             : 
      88             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzwrite, 0, 0, 2)
      89             :         ZEND_ARG_INFO(0, fp)
      90             :         ZEND_ARG_INFO(0, str)
      91             :         ZEND_ARG_INFO(0, length)
      92             : ZEND_END_ARG_INFO()
      93             : 
      94             : ZEND_BEGIN_ARG_INFO(arginfo_bzflush, 0)
      95             :         ZEND_ARG_INFO(0, fp)
      96             : ZEND_END_ARG_INFO()
      97             : /* }}} */
      98             : 
      99             : static const zend_function_entry bz2_functions[] = {
     100             :         PHP_FE(bzopen,       arginfo_bzopen)
     101             :         PHP_FE(bzread,       arginfo_bzread)
     102             :         PHP_FALIAS(bzwrite,   fwrite,           arginfo_bzwrite)
     103             :         PHP_FALIAS(bzflush,   fflush,           arginfo_bzflush)
     104             :         PHP_FALIAS(bzclose,   fclose,           arginfo_bzflush)
     105             :         PHP_FE(bzerrno,      arginfo_bzerrno)
     106             :         PHP_FE(bzerrstr,     arginfo_bzerrstr)
     107             :         PHP_FE(bzerror,      arginfo_bzerror)
     108             :         PHP_FE(bzcompress,   arginfo_bzcompress)
     109             :         PHP_FE(bzdecompress, arginfo_bzdecompress)
     110             :         PHP_FE_END
     111             : };
     112             : 
     113             : zend_module_entry bz2_module_entry = {
     114             :         STANDARD_MODULE_HEADER,
     115             :         "bz2",
     116             :         bz2_functions,
     117             :         PHP_MINIT(bz2),
     118             :         PHP_MSHUTDOWN(bz2),
     119             :         NULL,
     120             :         NULL,
     121             :         PHP_MINFO(bz2),
     122             :         NO_VERSION_YET,
     123             :         STANDARD_MODULE_PROPERTIES
     124             : };
     125             : 
     126             : #ifdef COMPILE_DL_BZ2
     127             : ZEND_GET_MODULE(bz2)
     128             : #endif
     129             : 
     130             : struct php_bz2_stream_data_t {
     131             :         BZFILE *bz_file;
     132             :         php_stream *stream;
     133             : };
     134             : 
     135             : /* {{{ BZip2 stream implementation */
     136             : 
     137          10 : static size_t php_bz2iop_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
     138             : {
     139          10 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *) stream->abstract;
     140             :         size_t ret;
     141             :         
     142          10 :         ret = BZ2_bzread(self->bz_file, buf, count);
     143             : 
     144          10 :         if (ret == 0) {
     145           3 :                 stream->eof = 1;
     146             :         }
     147             : 
     148          10 :         return ret;
     149             : }
     150             : 
     151          15 : static size_t php_bz2iop_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
     152             : {
     153          15 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *) stream->abstract;
     154             : 
     155          15 :         return BZ2_bzwrite(self->bz_file, (char*)buf, count); 
     156             : }
     157             : 
     158          16 : static int php_bz2iop_close(php_stream *stream, int close_handle TSRMLS_DC)
     159             : {
     160          16 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
     161          16 :         int ret = EOF;
     162             :         
     163          16 :         if (close_handle) {
     164          16 :                 BZ2_bzclose(self->bz_file);
     165             :         }
     166             : 
     167          16 :         if (self->stream) {
     168           7 :                 php_stream_free(self->stream, PHP_STREAM_FREE_CLOSE | (close_handle == 0 ? PHP_STREAM_FREE_PRESERVE_HANDLE : 0));
     169             :         }
     170             : 
     171          16 :         efree(self);
     172             : 
     173          16 :         return ret;
     174             : }
     175             : 
     176          16 : static int php_bz2iop_flush(php_stream *stream TSRMLS_DC)
     177             : {
     178          16 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
     179          16 :         return BZ2_bzflush(self->bz_file);
     180             : }
     181             : /* }}} */
     182             : 
     183             : php_stream_ops php_stream_bz2io_ops = {
     184             :         php_bz2iop_write, php_bz2iop_read,
     185             :         php_bz2iop_close, php_bz2iop_flush,
     186             :         "BZip2",
     187             :         NULL, /* seek */
     188             :         NULL, /* cast */
     189             :         NULL, /* stat */
     190             :         NULL  /* set_option */
     191             : };
     192             : 
     193             : /* {{{ Bzip2 stream openers */
     194          16 : PHP_BZ2_API php_stream *_php_stream_bz2open_from_BZFILE(BZFILE *bz, 
     195             :                                                                                                                 char *mode, php_stream *innerstream STREAMS_DC TSRMLS_DC)
     196             : {
     197             :         struct php_bz2_stream_data_t *self;
     198             :         
     199          16 :         self = emalloc(sizeof(*self));
     200             : 
     201          16 :         self->stream = innerstream;
     202          16 :         self->bz_file = bz;
     203             : 
     204          16 :         return php_stream_alloc_rel(&php_stream_bz2io_ops, self, 0, mode);
     205             : }
     206             : 
     207          10 : PHP_BZ2_API php_stream *_php_stream_bz2open(php_stream_wrapper *wrapper,
     208             :                                                                                         char *path,
     209             :                                                                                         char *mode,
     210             :                                                                                         int options,
     211             :                                                                                         char **opened_path,
     212             :                                                                                         php_stream_context *context STREAMS_DC TSRMLS_DC)
     213             : {
     214          10 :         php_stream *retstream = NULL, *stream = NULL;
     215          10 :         char *path_copy = NULL;
     216          10 :         BZFILE *bz_file = NULL;
     217             : 
     218          10 :         if (strncasecmp("compress.bzip2://", path, 17) == 0) {
     219           0 :                 path += 17;
     220             :         }
     221          10 :         if (mode[0] == '\0' || (mode[0] != 'w' && mode[0] != 'r' && mode[1] != '\0')) {
     222           0 :                 return NULL;
     223             :         }
     224             : 
     225             : #ifdef VIRTUAL_DIR
     226             :         virtual_filepath_ex(path, &path_copy, NULL TSRMLS_CC);
     227             : #else
     228          10 :         path_copy = path;
     229             : #endif  
     230             : 
     231          10 :         if (php_check_open_basedir(path_copy TSRMLS_CC)) {
     232             : #ifdef VIRTUAL_DIR
     233             :                 free(path_copy);
     234             : #endif
     235           0 :                 return NULL;
     236             :         }
     237             :         
     238             :         /* try and open it directly first */
     239          10 :         bz_file = BZ2_bzopen(path_copy, mode);
     240             : 
     241          10 :         if (opened_path && bz_file) {
     242           0 :                 *opened_path = estrdup(path_copy);
     243             :         }
     244             : #ifdef VIRTUAL_DIR
     245             :         free(path_copy);
     246             : #endif
     247          10 :         path_copy = NULL;
     248             :         
     249          10 :         if (bz_file == NULL) {
     250             :                 /* that didn't work, so try and get something from the network/wrapper */
     251           1 :                 stream = php_stream_open_wrapper(path, mode, options | STREAM_WILL_CAST, opened_path);
     252             :         
     253           1 :                 if (stream) {
     254             :                         int fd;
     255           0 :                         if (SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD, (void **) &fd, REPORT_ERRORS)) {
     256           0 :                                 bz_file = BZ2_bzdopen(fd, mode);
     257             :                         }
     258             :                 }
     259             : 
     260             :                 /* remove the file created by php_stream_open_wrapper(), it is not needed since BZ2 functions
     261             :                  * failed.
     262             :                  */
     263           1 :                 if (opened_path && !bz_file && mode[0] == 'w') {
     264           0 :                         VCWD_UNLINK(*opened_path);
     265             :                 }
     266             :         }
     267             :         
     268          10 :         if (bz_file) {
     269           9 :                 retstream = _php_stream_bz2open_from_BZFILE(bz_file, mode, stream STREAMS_REL_CC TSRMLS_CC);
     270           9 :                 if (retstream) {
     271           9 :                         return retstream;
     272             :                 }
     273             : 
     274           0 :                 BZ2_bzclose(bz_file);
     275             :         }
     276             : 
     277           1 :         if (stream) {
     278           0 :                 php_stream_close(stream);
     279             :         }
     280             : 
     281           1 :         return NULL;
     282             : }
     283             : 
     284             : /* }}} */
     285             : 
     286             : static php_stream_wrapper_ops bzip2_stream_wops = {
     287             :         _php_stream_bz2open,
     288             :         NULL, /* close */
     289             :         NULL, /* fstat */
     290             :         NULL, /* stat */
     291             :         NULL, /* opendir */
     292             :         "BZip2",
     293             :         NULL, /* unlink */
     294             :         NULL, /* rename */
     295             :         NULL, /* mkdir */
     296             :         NULL  /* rmdir */
     297             : };
     298             : 
     299             : static php_stream_wrapper php_stream_bzip2_wrapper = {
     300             :         &bzip2_stream_wops,
     301             :         NULL,
     302             :         0 /* is_url */
     303             : };
     304             : 
     305             : static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int);
     306             : 
     307       20151 : static PHP_MINIT_FUNCTION(bz2)
     308             : {
     309       20151 :         php_register_url_stream_wrapper("compress.bzip2", &php_stream_bzip2_wrapper TSRMLS_CC);
     310       20151 :         php_stream_filter_register_factory("bzip2.*", &php_bz2_filter_factory TSRMLS_CC);
     311       20151 :         return SUCCESS;
     312             : }
     313             : 
     314       20187 : static PHP_MSHUTDOWN_FUNCTION(bz2)
     315             : {
     316       20187 :         php_unregister_url_stream_wrapper("compress.bzip2" TSRMLS_CC);
     317       20187 :         php_stream_filter_unregister_factory("bzip2.*" TSRMLS_CC);
     318             : 
     319       20187 :         return SUCCESS;
     320             : }
     321             : 
     322         148 : static PHP_MINFO_FUNCTION(bz2)
     323             : {
     324         148 :         php_info_print_table_start();
     325         148 :         php_info_print_table_row(2, "BZip2 Support", "Enabled");
     326         148 :         php_info_print_table_row(2, "Stream Wrapper support", "compress.bzip2://");
     327         148 :         php_info_print_table_row(2, "Stream Filter support", "bzip2.decompress, bzip2.compress");
     328         148 :         php_info_print_table_row(2, "BZip2 Version", (char *) BZ2_bzlibVersion());
     329         148 :         php_info_print_table_end();
     330         148 : }
     331             : 
     332             : /* {{{ proto string bzread(resource bz[, int length])
     333             :    Reads up to length bytes from a BZip2 stream, or 1024 bytes if length is not specified */
     334          16 : static PHP_FUNCTION(bzread)
     335             : {
     336             :         zval *bz;
     337          16 :         long len = 1024;
     338             :         php_stream *stream;
     339             : 
     340          16 :         if (FAILURE == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r|l", &bz, &len)) {
     341           2 :                 RETURN_FALSE;
     342             :         }
     343             :         
     344          14 :         php_stream_from_zval(stream, &bz);
     345             : 
     346          13 :         if ((len + 1) < 1) {
     347           1 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "length may not be negative");
     348           1 :                 RETURN_FALSE;
     349             :         }
     350             : 
     351          12 :         Z_STRVAL_P(return_value) = emalloc(len + 1);
     352          12 :         Z_STRLEN_P(return_value) = php_stream_read(stream, Z_STRVAL_P(return_value), len);
     353             :         
     354          12 :         if (Z_STRLEN_P(return_value) < 0) {
     355           0 :                 efree(Z_STRVAL_P(return_value));
     356           0 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "could not read valid bz2 data from stream");
     357           0 :                 RETURN_FALSE;           
     358             :         }
     359             :         
     360          12 :         Z_STRVAL_P(return_value)[Z_STRLEN_P(return_value)] = 0;
     361          12 :         Z_TYPE_P(return_value) = IS_STRING;
     362             : }
     363             : /* }}} */
     364             : 
     365             : /* {{{ proto resource bzopen(string|int file|fp, string mode)
     366             :    Opens a new BZip2 stream */
     367          37 : static PHP_FUNCTION(bzopen)
     368             : {
     369             :         zval    **file;   /* The file to open */
     370             :         char     *mode;   /* The mode to open the stream with */
     371             :         int      mode_len;
     372             : 
     373             :         BZFILE   *bz;     /* The compressed file stream */
     374          37 :         php_stream *stream = NULL;
     375             :         
     376          37 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "Zs", &file, &mode, &mode_len) == FAILURE) {
     377           1 :                 return;
     378             :         }
     379             : 
     380          36 :         if (mode_len != 1 || (mode[0] != 'r' && mode[0] != 'w')) {
     381           3 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "'%s' is not a valid mode for bzopen(). Only 'w' and 'r' are supported.", mode);
     382           3 :                 RETURN_FALSE;
     383             :         }
     384             : 
     385             :         /* If it's not a resource its a string containing the filename to open */
     386          33 :         if (Z_TYPE_PP(file) == IS_STRING) {
     387          12 :                 if (Z_STRLEN_PP(file) == 0) {
     388           2 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "filename cannot be empty");
     389           2 :                         RETURN_FALSE;
     390             :                 }
     391             :                 
     392          10 :                 if (CHECK_ZVAL_NULL_PATH(*file)) {
     393           0 :                         RETURN_FALSE;
     394             :                 }
     395             : 
     396          10 :                 stream = php_stream_bz2open(NULL,
     397             :                                                                         Z_STRVAL_PP(file), 
     398             :                                                                         mode, 
     399             :                                                                         REPORT_ERRORS, 
     400             :                                                                         NULL);
     401          21 :         } else if (Z_TYPE_PP(file) == IS_RESOURCE) {
     402             :                 /* If it is a resource, than its a stream resource */
     403             :                 int fd;
     404             :                 int stream_mode_len;
     405             : 
     406          19 :                 php_stream_from_zval(stream, file);
     407          19 :                 stream_mode_len = strlen(stream->mode);
     408             :                 
     409          19 :                 if (stream_mode_len != 1 && !(stream_mode_len == 2 && memchr(stream->mode, 'b', 2))) {
     410           8 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot use stream opened in mode '%s'", stream->mode);
     411           8 :                         RETURN_FALSE;
     412          11 :                 } else if (stream_mode_len == 1 && stream->mode[0] != 'r' && stream->mode[0] != 'w' && stream->mode[0] != 'a' && stream->mode[0] != 'x') {
     413           0 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot use stream opened in mode '%s'", stream->mode);
     414           0 :                         RETURN_FALSE;
     415             :                 }
     416             : 
     417          11 :                 switch(mode[0]) {
     418             :                         case 'r':
     419             :                                 /* only "r" and "rb" are supported */
     420           6 :                                 if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])) {
     421           3 :                                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot read from a stream opened in write only mode");
     422           3 :                                         RETURN_FALSE;
     423             :                                 }
     424           3 :                                 break;
     425             :                         case 'w':
     426             :                                 /* support only "w"(b), "a"(b), "x"(b) */
     427          10 :                                 if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])
     428           3 :                                         && stream->mode[0] != 'a' && !(stream_mode_len == 2 && stream->mode[1] != 'a')
     429           2 :                                         && stream->mode[0] != 'x' && !(stream_mode_len == 2 && stream->mode[1] != 'x')) {
     430           1 :                                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot write to a stream opened in read only mode");
     431           1 :                                         RETURN_FALSE;
     432             :                                 }
     433             :                                 break;
     434             :                         default:
     435             :                                 /* not reachable */
     436             :                                 break;
     437             :                 }
     438             : 
     439           7 :                 if (FAILURE == php_stream_cast(stream, PHP_STREAM_AS_FD, (void *) &fd, REPORT_ERRORS)) {
     440           0 :                         RETURN_FALSE;
     441             :                 }
     442             :                 
     443           7 :                 bz = BZ2_bzdopen(fd, mode);
     444             : 
     445           7 :                 stream = php_stream_bz2open_from_BZFILE(bz, mode, stream);
     446             :         } else {
     447           2 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "first parameter has to be string or file-resource");
     448           2 :                 RETURN_FALSE;
     449             :         }
     450             : 
     451          17 :         if (stream) {
     452          16 :                 php_stream_to_zval(stream, return_value);
     453             :         } else {
     454           1 :                 RETURN_FALSE;
     455             :         }
     456             : }
     457             : /* }}} */
     458             : 
     459             : /* {{{ proto int bzerrno(resource bz)
     460             :    Returns the error number */
     461           7 : static PHP_FUNCTION(bzerrno)
     462             : {
     463           7 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRNO);
     464           7 : }
     465             : /* }}} */
     466             : 
     467             : /* {{{ proto string bzerrstr(resource bz)
     468             :    Returns the error string */
     469           7 : static PHP_FUNCTION(bzerrstr)
     470             : {
     471           7 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRSTR);
     472           7 : }
     473             : /* }}} */
     474             : 
     475             : /* {{{ proto array bzerror(resource bz)
     476             :    Returns the error number and error string in an associative array */
     477           7 : static PHP_FUNCTION(bzerror)
     478             : {
     479           7 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRBOTH);
     480           7 : }
     481             : /* }}} */
     482             : 
     483             : /* {{{ proto string bzcompress(string source [, int blocksize100k [, int workfactor]])
     484             :    Compresses a string into BZip2 encoded data */
     485           9 : static PHP_FUNCTION(bzcompress)
     486             : {
     487             :         char             *source;          /* Source data to compress */
     488           9 :         long              zblock_size = 0; /* Optional block size to use */
     489           9 :         long              zwork_factor = 0;/* Optional work factor to use */
     490           9 :         char             *dest = NULL;     /* Destination to place the compressed data into */
     491             :         int               error,           /* Error Container */
     492           9 :                                           block_size  = 4, /* Block size for compression algorithm */
     493           9 :                                           work_factor = 0, /* Work factor for compression algorithm */
     494             :                                           argc;            /* Argument count */
     495             :         int               source_len;      /* Length of the source data */
     496             :         unsigned int      dest_len;        /* Length of the destination buffer */ 
     497             : 
     498           9 :         argc = ZEND_NUM_ARGS();
     499             : 
     500           9 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|ll", &source, &source_len, &zblock_size, &zwork_factor) == FAILURE) {
     501           1 :                 return;
     502             :         }
     503             : 
     504             :         /* Assign them to easy to use variables, dest_len is initially the length of the data
     505             :            + .01 x length of data + 600 which is the largest size the results of the compression 
     506             :            could possibly be, at least that's what the libbz2 docs say (thanks to jeremy@nirvani.net 
     507             :            for pointing this out).  */
     508           8 :         dest_len   = (unsigned int) (source_len + (0.01 * source_len) + 600);
     509             :         
     510             :         /* Allocate the destination buffer */
     511           8 :         dest = emalloc(dest_len + 1);
     512             :         
     513             :         /* Handle the optional arguments */
     514           8 :         if (argc > 1) {
     515           6 :                 block_size = zblock_size;
     516             :         }
     517             :         
     518           8 :         if (argc > 2) {
     519           5 :                 work_factor = zwork_factor;
     520             :         }
     521             : 
     522           8 :         error = BZ2_bzBuffToBuffCompress(dest, &dest_len, source, source_len, block_size, 0, work_factor);
     523           8 :         if (error != BZ_OK) {
     524           4 :                 efree(dest);
     525           4 :                 RETURN_LONG(error);
     526             :         } else {
     527             :                 /* Copy the buffer, we have perhaps allocate a lot more than we need,
     528             :                    so we erealloc() the buffer to the proper size */
     529           4 :                 dest = erealloc(dest, dest_len + 1);
     530           4 :                 dest[dest_len] = 0;
     531           4 :                 RETURN_STRINGL(dest, dest_len, 0);
     532             :         }
     533             : }
     534             : /* }}} */
     535             : 
     536             : /* {{{ proto string bzdecompress(string source [, int small])
     537             :    Decompresses BZip2 compressed data */
     538          11 : static PHP_FUNCTION(bzdecompress)
     539             : {
     540             :         char *source, *dest;
     541             :         int source_len, error;
     542          11 :         long small = 0;
     543             : #if defined(PHP_WIN32)
     544             :         unsigned __int64 size = 0;
     545             : #else
     546          11 :         unsigned long long size = 0;
     547             : #endif
     548             :         bz_stream bzs;
     549             : 
     550          11 :         if (FAILURE == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &source, &source_len, &small)) {
     551           2 :                 RETURN_FALSE;
     552             :         }
     553             : 
     554           9 :         bzs.bzalloc = NULL;
     555           9 :         bzs.bzfree = NULL;
     556             : 
     557           9 :         if (BZ2_bzDecompressInit(&bzs, 0, small) != BZ_OK) {
     558           2 :                 RETURN_FALSE;
     559             :         }
     560             : 
     561           7 :         bzs.next_in = source;
     562           7 :         bzs.avail_in = source_len;
     563             : 
     564             :         /* in most cases bz2 offers at least 2:1 compression, so we use that as our base */
     565           7 :         bzs.avail_out = source_len * 2;
     566           7 :         bzs.next_out = dest = emalloc(bzs.avail_out + 1);
     567             :         
     568          14 :         while ((error = BZ2_bzDecompress(&bzs)) == BZ_OK && bzs.avail_in > 0) {
     569             :                 /* compression is better then 2:1, need to allocate more memory */
     570           0 :                 bzs.avail_out = source_len;
     571           0 :                 size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
     572           0 :                 dest = safe_erealloc(dest, 1, bzs.avail_out+1, (size_t) size );
     573           0 :                 bzs.next_out = dest + size;
     574             :         }
     575             : 
     576          11 :         if (error == BZ_STREAM_END || error == BZ_OK) {
     577           4 :                 size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
     578           4 :                 dest = safe_erealloc(dest, 1, (size_t) size, 1);
     579           4 :                 dest[size] = '\0';
     580           4 :                 RETVAL_STRINGL(dest, (int) size, 0);
     581             :         } else { /* real error */
     582           3 :                 efree(dest);
     583           3 :                 RETVAL_LONG(error);
     584             :         }
     585             : 
     586           7 :         BZ2_bzDecompressEnd(&bzs);
     587             : }
     588             : /* }}} */
     589             : 
     590             : /* {{{ php_bz2_error()
     591             :    The central error handling interface, does the work for bzerrno, bzerrstr and bzerror */
     592          21 : static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int opt)
     593             : { 
     594             :         zval         *bzp;     /* BZip2 Resource Pointer */
     595             :         php_stream   *stream;
     596             :         const char   *errstr;  /* Error string */
     597             :         int           errnum;  /* Error number */
     598             :         struct php_bz2_stream_data_t *self;
     599             :         
     600          21 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &bzp) == FAILURE) {
     601           0 :                 return;
     602             :         }
     603             : 
     604          21 :         php_stream_from_zval(stream, &bzp);
     605             : 
     606          18 :         if (!php_stream_is(stream, PHP_STREAM_IS_BZIP2)) {
     607           0 :                 RETURN_FALSE;
     608             :         }
     609             : 
     610          18 :         self = (struct php_bz2_stream_data_t *) stream->abstract;
     611             :         
     612             :         /* Fetch the error information */
     613          18 :         errstr = BZ2_bzerror(self->bz_file, &errnum);
     614             :         
     615             :         /* Determine what to return */
     616          18 :         switch (opt) {
     617             :                 case PHP_BZ_ERRNO:
     618           6 :                         RETURN_LONG(errnum);
     619             :                         break;
     620             :                 case PHP_BZ_ERRSTR:
     621           6 :                         RETURN_STRING((char*)errstr, 1);
     622             :                         break;
     623             :                 case PHP_BZ_ERRBOTH:
     624           6 :                         array_init(return_value);
     625             :                 
     626           6 :                         add_assoc_long  (return_value, "errno",  errnum);
     627           6 :                         add_assoc_string(return_value, "errstr", (char*)errstr, 1);
     628             :                         break;
     629             :         }
     630             : }
     631             : /* }}} */
     632             : 
     633             : #endif
     634             : 
     635             : /*
     636             :  * Local variables:
     637             :  * tab-width: 4
     638             :  * c-basic-offset: 4
     639             :  * End:
     640             :  * vim600: fdm=marker
     641             :  * vim: noet sw=4 ts=4
     642             :  */

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